DEIF ASK 31.3 VDE 0414 IEC 60044-1 Product Description

Overview

DEIF ASK 31.3 VDE 0414 IEC 60044-1 is presented as a plug-in or slip-on measuring current transformer for switchgear, protection, metering or power monitoring circuits. The ASK 31.3 family public datasheet covers plug-in current transformers for primary nominal currents from 50 A to 750 A, secondary nominal current 5 A or 1 A, with optional 2 A, and accuracy classes 0.2s, 0.5 and 1, with optional class 0.2 and 0.5s. The standards referenced in the supplied record, VDE 0414 and IEC 60044-1, correspond to current transformer measurement and insulation requirements; exact primary ratio, burden and class for the supplied unit must be verified against the transformer rating plate.

Features

The ASK 31.3 transformer is a plug-in current transformer designed for busbar or round-conductor installation. Public datasheet records list compatible busbar arrangements 30 × 10 mm or 2 × 20 × 10 mm, and round conductor diameter 26 mm. The housing is unbreakable black polycarbonate, flame resistant and ultrasonically welded. Secondary terminals are nickel-plated with nickel-plated screws, size M5 × 10 mm, and secondary caps are integrated.

Thermal nominal continuous current is 1.0 × IN. Thermal nominal short-time current Ith is 60 × IN for 1 second. Maximum operating voltage Um is 0.72 kV. Isolation test voltage is 3 kV RMS at 50 Hz for 1 minute. Nominal rated frequency is 50 Hz per datasheet record, and isolation class is E.

The working temperature range is -5 to +40 degrees Celsius, and storage temperature range is -25 to +40 degrees Celsius. Datasheet dimensions listed are width 61 mm, height 75.5 mm and depth 48 mm. The transformer package quantity is 1 piece, with customs tariff number 85043129 in the public GMW datasheet record.

Specs

Brand or supplied maker: DEIFModel: ASK 31.3Standards referenced: VDE 0414, IEC 60044-1Product type: Plug-in or slip-on measuring current transformer Primary nominal current range: 50 A to 750 A per ASK 31.3 family record Secondary nominal current: 5 A or 1 A; optional 2 AExact ratio: Unconfirmed; verify rating plate Accuracy class: 0.2s, 0.5, 1; optional 0.2, 0.5s per family record Exact burden or VA: Unconfirmed for supplied unit; verify rating plate Thermal nominal continuous current: 1.0 × INThermal nominal short-time current Ith: 60 × IN, 1 secondMaximum operating voltage Um: 0.72 kVIsolation test voltage: 3 kV RMS, 50 Hz, 1 minuteNominal rated frequency: 50 Hz per datasheet record Isolation class: EBusbar 1: 30 × 10 mmBusbar 2: 2 × 20 × 10 mmRound conductor diameter: 26 mmHousing: Black polycarbonate, flame resistant, ultrasonically welded Secondary terminals: Nickel-plated, M5 × 10 mm nickel-plated screws Secondary caps: Integrated Width: 61 mmHeight: 75.5 mmDepth: 48 mmWorking temperature: -5 to +40 degrees CelsiusStorage temperature: -25 to +40 degrees CelsiusTariff number: 85043129 per public datasheet record Product status: Existing-installation measuring current transformer spare

Principle

A current transformer transforms a high primary line current into a standard low secondary current for measurement, protection or monitoring devices. The primary conductor or busbar passes through the transformer window, and the secondary winding supplies a proportional current to an ammeter, protection relay, energy meter, PLC input or monitoring device. The current transformer isolates the measuring or protection circuit from the primary power circuit while preserving the current ratio for accurate metering or protection coordination.

The ASK 31.3 secondary circuit must remain connected to the burden or measurement device during primary energization; an open secondary current transformer can generate dangerous voltage and must not be opened while the primary circuit is live. Replacement should verify the primary and secondary ratio, accuracy class, burden in VA, short-time current, busbar or conductor size, terminal polarity, wiring, grounding requirement, insulation condition and compliance with the local protection or metering scheme.

Applications

DEIF ASK 31.3 VDE 0414 IEC 60044-1 is used in existing low-voltage and medium-voltage switchgear, motor control centers, feeder panels, generator or transformer protection, energy metering, power monitoring, pump or compressor controls, process equipment, marine electrical systems, utilities and general industrial current measurement. In legacy installations, the transformer serves as a direct replacement metering or protection current transformer spare when the ratio, accuracy, burden, window size, terminal wiring and connected device match the original unit.